The people that are most famous for pledging to give it all away — Gates, Buffet — are far far richer than they were when the hoi polloi started reading public relations articles about their philanthropic pledge.
Amazing PR scam.
Amazing PR scam.
Also note that the pledge is only to give away "at least half" which is pretty unambitious for a multi-billionaire. If you have $10 billion and give away $5 billion, you've made no impact on your own life and sacrificed nothing. It is not comparable to someone with $100,000 giving away $50,000.